面向出口匝道拥挤的快速路速度协调控制模型

Speed Harmonization Model for Offramp Bottlenecks on Urban Expressway

摘要:

为缓解快速路出口匝道的交通拥挤，提出了从主线上进行速度协调控制的方法，在现有基于断面的速度协调控制模型的基础上，通过对入口匝道、出口匝道等的修正构建了面向出口匝道的基于车道的速度协调控制模型，描述和预测每个车道的交通流状态，以路网行程时间最短、总通过量最大为优化目标，对每个车道分别进行最佳速度引导.并搭建仿真系统，分析不同交通需求情形下，基于车道和基于断面的速度协调控制策略的实施效果.结果表明：速度协调控制策略更加适用于中高密度，当交通需求量较高时，相比于无控制策略，基于车道和基于断面的速度协调控制模型均能降低车辆平均延误，且在大多数情形下，基于车道的速度协调控制模型效果优于基于断面的控制模型，对缓解交通拥堵、提高交通安全具有一定助益.

Abstract:

In order to mitigate the traffic congestion around the off-ramp，the speed harmonization control method of main line is proposed. Based on existing section-based speed harmonization model, a lane-based speed harmonization model was designed with factors of on-ramp and off-ramp. The model can describe and forecast the traffic state, and give the optimal speed on each lane with shortest travel time as well as maximum total through traffic volume. Finally, the simulation system was developed to scientifically evaluate the effectiveness of lane-based and sectionbased speed harmonization model in different traffic demand situations. The simulation results indicated that, speed harmonization strategy is more adaptive for medium and high traffic flow density. When traffic demand is high, both of lane-based model and section-based model can reduce the vehicle average delay compared to no control strategies, and in most cases, the lane-based speed harmonization model is superior to the section-based model, which is helpful to mitigate traffic congestion and improve traffic safety.